Time & Date Tools

Calculate dates, ages, durations, timestamps, and calendar differences.

Available Tools (9)

Add or subtract days from a start date to compute the exact future or past target calendar date.

Calculate exact age in years, months, and days for any comparison date, plus total days and the next birthday.

Calculate the number of business days (weekdays Monday through Friday) and weekend days between two dates.

Find the number of days and full weeks between two calendar dates, in either direction, with optional inclusive counting.

Calculate the exact number of days remaining or elapsed until any target date or event.

Check whether any year is a leap year and review the exact Gregorian leap-year rules.

Calculate the exact time difference between two times, including overnight and midnight-crossing durations.

Convert Unix epoch seconds or milliseconds to readable dates and ISO 8601 timestamps.

Find the ISO 8601 week number, ISO year, and day of week for any date.